AC electrical properties of conjugated polymers and theoretical high-frequency behavior of multilayer films

C. Y. Lee, H. M. Kim, J. W. Park, Y. S. Gal, J. I. Jin, Jinsoo Joo

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

AC electrical properties of various conjugated polymers such as emeraldine base form of polyaniline, polyacetylene derivatives, and poly(1,4-phenylenevinylene) and its derivative are studied. Dielectric constant and conductivity are measured in the frequency range from 10 Hz to 2 MHz and in the temperature range from 78 to 300 K. Frequency dependence of ac dielectric constant follows Debye or Cole-Cole dielectric relaxation equation, and temperature dependence of relaxation time τ follows Arrhenius equation τ = τ0 exp(Ea/kBT). Frequency dependence of ac conductivity shows a constant behavior in low-frequency regime (≤10 kHz) and a power-law behavior (σ approximately ω+s$/) in high-frequency regime (≥100 kHz). For the applications of multilayer films of conducting polymers such as electromagnetic interference (EMI) shielding or optical filter, we theoretically calculate the reflectance, absorbance, and EMI shielding efficiency in high-frequency range (≥1 GHz) based on plane wave theory.

Original languageEnglish
Pages (from-to)109-113
Number of pages5
JournalSynthetic Metals
Volume117
Issue number1-3
DOIs
Publication statusPublished - 2001 Feb 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Polymers and Plastics

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